/Engine/Source/Editor/GameProjectGeneration/Public/AddToProjectConfig.h
Optional argument that specifies the default name for the new class being added. The user will be able to type their own name if they don't like this name. If empty, defaults to the name of the inherited class.
[FAddToProjectConfig](API\Editor\GameProjectGeneration\FAddToProjectConfig) & DefaultClassName ( [FString](API\Runtime\Core\Containers\FString) InDefaultClassName )